Mid-week freeze appears likely for St. Louis area

The coldest air since 1986 arrives this late in the season on Tuesday and lasts until early Thursday

ST. LOUIS – Big changes are coming to St. Louis in the middle of the week. The coldest air since 1986 arrives this late in the season on Tuesday and lasts until early Thursday. A frost watch was posted for the area from 1 a.m. to 9 a.m. on Wednesday.

A cold front will move into our region late Monday and fall south by Tuesday morning. The cooler air is filtered overnight on Monday and really pulled into area 5 On Your Side by late Tuesday afternoon through Tuesday evening.

Snow will have developed in parts of northern Missouri by early Tuesday morning. This area will move southeast during the day and will likely begin as rain in the subway area by late morning.

During the afternoon, when colder air moves overhead, the rain can mix with the snow or even turn into snow before it ends on Tuesday evening. Since the ground is warm and temperatures remain well above freezing point, the roads should not be iced over. Muddy buildup can occur on grassy areas north and west of the subway area.

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With the growing season already beginning, temperatures are expected to drop below freezing early Wednesday morning. Some of the coldest spots fall in the mid to upper 20s. A light breeze could limit the amount of frost that occurs, but delicate plants that cannot tolerate freezing temperatures need protection from the cold.

If you’ve already connected your water hose, unhook it and drain it by Tuesday evening so the hose doesn’t freeze and burst.

Another cold night Wednesday evening into early Thursday can result in a better chance of frost when the wind gets weak. Temperatures along and west of the Mississippi River are expected to be a little less cold early Thursday. East of St. Louis, it may be another loop with temperatures near or below freezing.

The weekend is expected to start on the humid side with showers on Friday through the first half of Saturday. We expect a transition to a warmer pattern by the end of the weekend next week.

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